1.6 with Greddy @ 14 PSI
http://img38.imagefra.me/img/img38/6...gm_b7491df.gif
About what I expected. Spools up decently, but that tiny little turbo is running out of steam at the top end. Even though IAT was still decent, going from ~12.5 PSI to ~14.5 PSI yielded smaller returns than expected, which says to me that turbine backpressure is probably the limiting factor here. Spark advance was in the 18-20° range here. (This is with WI @ 5 GPH.) I saw a little knock at about 5,000 RPM when I got up to 23°. Leaning out the mixture gave large gains in the midrange from where we started. On the first run, I was down in the mid 11s the whole way. Bringing that up into the mid 12s was beneficial, and I could probably still stand to lean out that dip around 5,000. All in all, not too bad for a Greddy. Putting aside that little burble at ~7,000 RPM it put down an honest 205 HP and 202 ft/lbs. |
What size are the charge pipes/exhaust piping?
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I like the nice, flat boost plot once target boost is reached with no tapering towards redline.
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Originally Posted by kotomile
(Post 572866)
What size are the charge pipes/exhaust piping?
Exhaust is a TurboTony downpipe (non-seperated) and the whole system is 2.5" from the turbine to the tailpipe, with a ceramic-core cat. Manifold is stock Greddy. So basically, I don't see any room for improvement there, short of removing the cat. I think we're just looking at what happens when you have a small turbine putting a lot of exhaust backpressure on the head.
Originally Posted by Bryce
(Post 572869)
I like the nice, flat boost plot once target boost is reached with no tapering towards redline.
The fix is very simple. Just install a nipple in the piping after the intercooler, and feed your boost controller with that. Presto-chango, nice flat boost curve. |
Hmm, haven't we seen better numbers from greddy setups before? not being a dick, just curious where the improvements are there versus here
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Didn't Ben get 250 from his?
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Very solid and smooth. Looks like a very street friendly powerband. nice jerb:)
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not only that, but kotos sig indicates he is as well
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judging by the spool speed, im going to suggest teh 2.5" exhaust is hurting you.
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Originally Posted by 18psi
(Post 572939)
Very solid and smooth. Looks like a very street friendly powerband. nice jerb:)
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Were you running water/meth or straight water? I also would have thought slightly higher numbers, but Brain may be right with the 2.5" exhaust since you have a cat. When the shop finishes my motor, I guess I'll find out. I plan to run 15psi with water/meth, BEGI downpipe and 3" exhaust with no cat. They haven't even had a chance to look at my pile of parts yet, so who knows when that'll be...
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Originally Posted by levnubhin
(Post 572934)
Didn't Ben get 250 from his?
http://www.megasquirtpnp.com/images/...mbc_vs_ebc.jpg |
That's a pretty nice plot, Ben. What ignition advance were you running up there?
I am running 91 octane SoCal gas, which isn't exactly the happiest combustible liquid around. Even with WI, I was definitely running into the knock limit. And I imagine that pulling the cat (or at least replacing it with a metal-core) would help things a lot. TrickerZ, straight water. |
Maybe it's just me, but it seems like you are injecting a lot of water. What made you decide on the 5gph nozzle?
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91oct needs LOTS of help to keep from detonating.
They don't call it camel piss for nothing |
Originally Posted by 18psi
(Post 573029)
91oct needs LOTS of help to keep from detonating.
They don't call it camel piss for nothing |
:giggle:
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1 Attachment(s)
Originally Posted by Joe Perez
(Post 572985)
What ignition advance were you running up there?
General disclaimers: This was on my car for a couple of years. I assume it's still on the car, but I haven't heard from the new owner in more than a year. It is a very aggressive table, created from many hours on the dyno. I post it for reference only and in no way advise anyone to copy it. If you simply slap my table into your ECU, you may possibly destroy your motor. I would suggest the MSPNP basemap's ignition table as a better starting point. |
Wow, I never knew the difference between MBC and EBC was so huge.
Any idea how much timing has to be pulled to run 91oct from 94oct? |
Originally Posted by Jeff_Ciesielski
(Post 573030)
I doubt the difference between 91 california camel piss and 92 octane seattle hobo piss is that drastic.
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